Bad UX when directly selecting a newsletter

[xperseguers]

When you open module Direct Mail and select a newsletter (thus a regular page) within the page tree instead of a DM folder, you get following error message:

This is totally counter intuitive for editors. Please adapt the text to something like:

This type of page cannot be used to create direct mails. Please select a Direct Mail folder.

(or alike).

Many thanks for my editors!